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4. ADJUSTING THE SEWING MACHINE
4-1. Thread tension
WARNING :
In case of thread-breakage. It may occur that the thread tangles on the thread take-up lever. In this case,
remove the thread tangling around the thread take-up lever by raising the thread take-up cover. At this
time, be careful not to cut your ngers with the knife.
4-1-1. Adjusting the needle thread tension
1) Adjust the needle thread tension using the tension nut
.
Turning the tension nut clockwise increases the needle thread
tension, or counterclockwise decreases it.
1. If the thread tension of pre-tension
is too low,
the thread may slip out of rotary disc
. Adjust the
thread tension of the pre-tension, using pre-tension
adjusting nut
taking care of tension balance
between the pre-tension and the rotary disc.
2. When setting the needle thread tension, draw the
thread in the direction F to check that rotary disc
smoothly rotates with no slippage.
When the rotary disc slips, tighten pre-tension
adjusting nut
.
3.
Thread tension disc felt
is a consumable part.
When rotary disc
slips, there is a possibility that the
thread tension disc felt
has been consumed. Replace
the felt with new one (Part No. : 22528509 × 4 pcs.).
4. When thick thread (approximately #30 or lower) is
used for needle thread, thread tension is apt to be
insucient with the rotary tension controller of the
standard delivery. In this case, use the optional
thread tension disk asm. (part No. : 40017095).
F
4-1-2. Adjusting the bobbin thread tension
1) The tension of the bobbin thread is adjusted by
turning the tension adjusting screw
.
Turn it clockwise to increase.
Turn it counterclockwise to decrease.
Increase
Decrease
4-2. Thread take-up spring
4-2-1. Adjusting the thread take-up spring
strength
1) Securely tighten tension post tightening screw
. Adjust the thread take-up spring strength by
tting a screwdriver in the slit on tension post
.
Turn it clockwise to increase.
Turn it counterclockwise to decrease.
4-2-2. Adjusting the thread take-up amount of the
thread take-up spring
1) Loosen tension post tightening screw
. Adjust
thread take-up amount by turning tension post
base
.
Adjustable range of the amount of thread taken
by the thread take-up spring : 6 to 10 mm
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